P/2017 U3 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2017 U3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-04-21T20:05:53.658240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:39Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-08-27.0000000 |
| e |
0.09998087 |
| q (au) |
4.443406 |
| a (au) |
4.937013 |
| i (deg) |
15.908436 |
| Ω (om, deg) |
165.150002 |
| ω (w, deg) |
297.458320 |
| M (ma, deg) |
305.836360 |
等級
散乱 + 全体線形
$$
M_a = (15.774 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.774 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.580 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:16:11.78 |
-09:37:18.2 |
HIP 104995 |
14.44 |
| 2026-02-03 12:00 |
21:16:38.20 |
-09:35:47.6 |
HIP 104995 |
16.28 |
| 2026-02-04 00:00 |
21:17:04.62 |
-09:34:16.5 |
HIP 104995 |
20.28 |
| 2026-02-04 12:00 |
21:17:31.03 |
-09:32:45.0 |
HIP 104995 |
25.43 |
| 2026-02-05 00:00 |
21:17:57.45 |
-09:31:13.2 |
HIP 105258 |
19.54 |
| 2026-02-05 12:00 |
21:18:23.86 |
-09:29:40.9 |
HIP 105258 |
13.67 |
| 2026-02-06 00:00 |
21:18:50.27 |
-09:28:08.2 |
HIP 105258 |
9.05 |
| 2026-02-06 12:00 |
21:19:16.67 |
-09:26:35.2 |
HIP 105258 |
8.15 |
| 2026-02-07 00:00 |
21:19:43.07 |
-09:25:01.7 |
HIP 105258 |
11.86 |
| 2026-02-07 12:00 |
21:20:09.47 |
-09:23:27.9 |
HIP 105258 |
17.45 |
| 2026-02-08 00:00 |
21:20:35.86 |
-09:21:53.6 |
HIP 105389 |
13.27 |
| 2026-02-08 12:00 |
21:21:02.24 |
-09:20:19.0 |
HIP 105389 |
11.61 |
| 2026-02-09 00:00 |
21:21:28.62 |
-09:18:44.1 |
HIP 105491 |
7.47 |
| 2026-02-09 12:00 |
21:21:54.99 |
-09:17:08.7 |
HIP 105491 |
2.68 |
| 2026-02-10 00:00 |
21:22:21.35 |
-09:15:33.0 |
HIP 105491 |
6.95 |
| 2026-02-10 12:00 |
21:22:47.70 |
-09:13:56.9 |
HIP 105574 |
5.62 |
| 2026-02-11 00:00 |
21:23:14.04 |
-09:12:20.5 |
HIP 105574 |
8.10 |
| 2026-02-11 12:00 |
21:23:40.38 |
-09:10:43.7 |
HIP 105574 |
13.76 |
| 2026-02-12 00:00 |
21:24:06.70 |
-09:09:06.6 |
HIP 105574 |
20.07 |
| 2026-02-12 12:00 |
21:24:33.01 |
-09:07:29.1 |
HIP 105574 |
26.57 |
| 2026-02-13 00:00 |
21:24:59.31 |
-09:05:51.3 |
HIP 105574 |
33.15 |
| 2026-02-13 12:00 |
21:25:25.60 |
-09:04:13.1 |
HIP 105939 |
28.28 |
| 2026-02-14 00:00 |
21:25:51.87 |
-09:02:34.7 |
HIP 105939 |
21.71 |
| 2026-02-14 12:00 |
21:26:18.13 |
-09:00:55.9 |
HIP 105939 |
15.25 |
| 2026-02-15 00:00 |
21:26:44.37 |
-08:59:16.7 |
HIP 105939 |
9.13 |
| 2026-02-15 12:00 |
21:27:10.60 |
-08:57:37.3 |
HIP 105939 |
4.86 |
| 2026-02-16 00:00 |
21:27:36.81 |
-08:55:57.6 |
HIP 105939 |
7.30 |
| 2026-02-16 12:00 |
21:28:03.01 |
-08:54:17.5 |
HIP 105939 |
13.12 |
| 2026-02-17 00:00 |
21:28:29.18 |
-08:52:37.2 |
HIP 106055 |
9.00 |
| 2026-02-17 12:00 |
21:28:55.34 |
-08:50:56.5 |
HIP 106055 |
8.52 |
| 2026-02-18 00:00 |
21:29:21.48 |
-08:49:15.6 |
HIP 106055 |
12.39 |
| 2026-02-18 12:00 |
21:29:47.60 |
-08:47:34.4 |
HIP 106142 |
11.78 |
| 2026-02-19 00:00 |
21:30:13.70 |
-08:45:52.9 |
HIP 106142 |
10.51 |
| 2026-02-19 12:00 |
21:30:39.78 |
-08:44:11.1 |
HIP 106268 |
11.91 |
| 2026-02-20 00:00 |
21:31:05.84 |
-08:42:29.0 |
HIP 106268 |
5.85 |
| 2026-02-20 12:00 |
21:31:31.87 |
-08:40:46.8 |
HIP 106268 |
3.92 |
| 2026-02-21 00:00 |
21:31:57.88 |
-08:39:04.2 |
HIP 106268 |
9.22 |
| 2026-02-21 12:00 |
21:32:23.87 |
-08:37:21.4 |
HIP 106268 |
15.59 |
| 2026-02-22 00:00 |
21:32:49.83 |
-08:35:38.3 |
HIP 106268 |
22.12 |
| 2026-02-22 12:00 |
21:33:15.77 |
-08:33:55.0 |
HIP 106268 |
28.70 |
| 2026-02-23 00:00 |
21:33:41.68 |
-08:32:11.5 |
HIP 106268 |
35.30 |
| 2026-02-23 12:00 |
21:34:07.56 |
-08:30:27.7 |
HIP 106545 |
35.86 |
| 2026-02-24 00:00 |
21:34:33.42 |
-08:28:43.8 |
HIP 106545 |
36.57 |